Collet-chuck.



HI.'C.` WOGLOM.

COLLET CHUCK. APPucm-mu man Aua.22.19`\7.

Patented May 1919.

2 SHEETS-SHEETZ UNITED STATES PATENT OFFICE.`

HOW-LRDZC. 4WOGLQIW, `01|?fIlM-BJJZFORI?,-('JONNECTIQUE, .ASSIGNDR T0 PRATT .& WHITNEY COMPANY, F NEW YORK, N.,`,Y., A CORPORATION 0F NEW JERSEY.

COLLET-CHUCK.

Spqcieation of LettersPatentv Patented. Mayf., 191th Toiallfiwlwm t may concemf:

Beit kn-own that L Hownnn 1G. Weenoinf a citizen-of the Uni-tedfStates,1residingiat l5 StatefofCnneotiouty have -invented certain new anduseful Improvements in i Collet# Chuoksoffwhieh the followingis a speeii oationei" The -1 inventionrelates -partioularly to a collet-chuck mechanism ofjthe draw-beek step type;` A `chuckof-this` type has a plui ralityioffj'aws which' are =in engagement with' an; annular-beveled `surface loi?l thefmain chuck body-so :that lwhenwthe j awe are drawn 'backwardfinto the-.ibody*they arel forced `toward eaoh'aother'to gripfthework. Thejawsare formedMor-flprovided With ani annular shoultemofiftheuwork blank' to =be=tu1=nedg`and suit- A e ablelmeans-are ipnovidediffor engaging each* blanhzto-.deeemnethelongtudinai:position L tliereoiivl i Inachueks of lthis-tye", as^'fo11dinarily non-- strnotedf heretaifore54 i longitudinally:

i extents in aooordance with vatiationssinf the diameters ofthe workeblanksfon `in accordance with'the ameuntofrforoe applied. f For f this reason inrfehuoksf as-henetoforei con-A structedfthe `longitudin-al positioning fof-fthe i 3 5 Work t blanks `mvvas, g very: z inaeeurately ydone,`

with Ethe'* result i that e when the pieces ifwere' fatedfftheV thiokness variedr "considerably". in accordancewithy variationsfiin the external diameter-or variations .in thedefgiee of'tight- 4.0 y enin aofi thefehueke Th z Vprineipaliobectfof 'this inventionwis to .provide aehuek oth'e typefde'seribed, wherein i are provided improved 'means Asup lemental to or: independantV of :the ohuelzl r Jaws for :accurately determini-ng fthe4 longia tudinal ypositiollmoffthe: blanks;` Other objects-fof :the inventionmwilflfbe app arent from i theA followings epecieationfv and cl-aims. l

' InI theaaoooxnpanyinglgdrawings, ,Iiha'veshowin,y thiefsfenabollmentvh of theA invention: whichnI knew prefer, and;y in! fonderfthat they invention `n'1a@ v-b`e1'olearly fundetstoodn I haveshown la chuokf-i in.-.eonjunetionf` with L a lathe spindle and suitablefoperating partel It will 66 t be=understood5fhoweventhat various :changes v andsubstitutionsolequivalents may bernade f as -ooneerns thewoonstruetion of the .ohucln and itiwilliibewfurtherundeiretood rthat, ascon'eerns the others spar/ts shown, therey canbe wide-variation as.: these of i themselvesf 60 constitute noxpartfof the present invention` Of 1the drawings Figure. l is ia ventioal longitudinal seetional -viewshowing a lathe headand a collet ohueki embodying. the.l invention.

Eig. .-2 is an enlargedseetional view showing-the fchuek;

Fign ie an end View of the chuck.

Fig.4 is aniend. view of the ehuekf ybody with the jaws removed;` 70

Figi-1,5 i. is =a detailedA sectional Vview taken along-.the line .5-5 of Fig.e 4. i

Ei disfapelrspeotive view. offthebehueln jaws:`

Referringfgto thei drawings;1'1.x'epresentsu75f the: headstoekrcasting'fof 'Ta .,latheeor shaving f nia-elaine', -this @casting being :provided ywith two bearings@ and 3" inwhieh' is monntedfva. .4 rotatable x hollow :spindle 4a Suitable i meansg r arepnovidedior diiving thea spindle;suche` 80` fori i instanee;` ass @the seti of f cone belt-pus1=` 1 Carried iby Ithe r hollowf-y spindle at; its folt-` ward:end-vandv'pneferably f held yin i place] by means` Aof the threada-G, .is an: annular cheek 1 85 bod-yd?. i They ohuekefbody has'` an;internal..` annular beveledfsurfaee 8 which decreasesind diameten tovvaielfthe` rear:

Pdsitiemedvwithin"1 the@ chuckI body 7 ai'ey eli-eek jawn-5` whieh; Solanas certain features f90 o'f` u1the.;:invelution l ane: concerne@ may f. be of 1* anyionei'ofuseveralieonstnuetions. I prefer, .1 howevera.' to pronidefj awe: ot the L spring ,rtype inowhiehcallofthejaws ane formed `fronrifaf singlerpieoeoffmetahas shown in perspective-fin.r 6.2 Thereweana be variation f as :oon c'ennsathegnuniberiv of jaws, but 'is :is :preview ablelto' provide three; The threelj aws 9,9, 9 arefsep-alrated zby slots -10 -fwhiehextend .rearwandbut-whioh terminate neanthe -edge-:ofztheohubI l1,- this hule1 servingl to i connecte` ally threeho the fj awe: Y

Threaded inte i anfaperturewin the hubff 11 is :a Jdraws-baeln.r'odi 12 f fon-'moving fthe 1hub and the jaws. The rod 12 is providedmear-f 105 itsfrear-end .iwith'ftw'o oppoeitely positioned lugsqlg '131' whieh are f engaged respeotivelyi by-;-khmk11evers 1 14 14, These levers. 14:; 14eme: adapted 'to be engaged-shy abeveledr. surlaoafo'tmedonfa slidablefoollar lwhioh 119 can be moved longitudinally by means of the hand lever 16. A spring 17 normally tends to move the rod and the jaws toward the ri t.

gllVhen the collar 15 is in its eXtreme lefthand position the levers 14, 14 are free to swing inward and the draak-back rod and the jaws are free to move toward the right. In this position the jaws are open and a work blank such as A can be inserted. When the lever 16 is swung to move the collar 15 toward the right, the levers 14, 14 are swung outward, thus engaging the lugs 13, 13 and drawing the rod 12 and the jaws toward the left. The jaws engage the beveled surface 8 and are thus forced radially inward toward each other and into firm engagement with the blank. The extent of movement of the jaws is limited by the work itself. Suitable means such as the pin 18 is provided for preventing relative rotative movement between the jaws and the chuck body. As illu-strated, the pin is threaded into one of the jaws and extends through an aperture in the body.

Preferably the jaws do not rectly with the work blank, but indirectly therewith through shoes 19, 19, 19 with which they are respectively provided. These shoes are preferable of cast iron or other soft metal so that they can be readily maengage dichined to form annular recesses such as' indicated at 20. The shoes 19, 19, 19 are readily detachable, being held in place, for instance, by screws 21, and it will be understood that these shoes are provided in quantities so that a set of them can be properly turned to fit blanks of any desired diameter. It will be noted that the screws 21 are countersunk to such a depth thatthe recesses 20 can be cut back so that the blanks can lie over the heads of the screws without interference.

In accordance with my inventionv I do not rely upon the bottoms of the recesses 20, or in fact upon any part of the movable jaws,

to determine the longitudinal position of the blank. I rovide supplemental stops which are carried by the chuck body, and whose positions are therefore entirely independent of the adjustment of the jaws. So far as the broader features of my invention are concerned, the stops can be of any one of several constructions, but in the drawings I have shown a. construction which I prefer as it has several important features of advantage. As shown, there are three stops which are positioned respectively in the slot between each two adjacent jaws. The three stops are represented in the drawings by 23, 23, 23.

As clearly appears in Fig. 2, the blank abuts against these stops to definitely determine its lon itudinal position. There is no movement o the blank as the jaws move toward the left, the jaws simply sliding over the surface of the blank until such time as the pressure is sufficient to grip the blank and prevent further movement. Obviously, the extent of movement of the jaws toward the left will depend to some extent on the diameter of the blank and will be less for a blank ay little over nominal diameter than for a blank a little under nominal diameter. There will also be variation in the extent of movement of the jaws depending upon the pressure which the operator applies. But this variation in the extent of movement of the jaws has no el'ect on the position of the blank, my improved chuck being in this respect different from and highly superior to other chucks as heretofore constructed.

It will be clear from the description which has been given that shoes 19 having differently diametered recesses may be provided so that the chuck may be adapted for holding 4blanks having a wide range of eX- ternal diameters. In order that the .stops 23 may be adapted for blanks having this wide range of diameter, it is preferable to make them radially adjustable. As shown in detail in Figs. 2 and 5, each stop 23 is mounted in a radial guideway 24 formed in the body of the chuck and is adjustable radially along this guideway. For clamping the stop in adjusted position there is provided a clamping block 2-5 adapted to be forced in place by means of a screw 26. Each slot 10 is widened as at 10a to accommodate the corresponding stop in any position. Preferably there is a groove 10b ex- 100 tending longitudinally of the jaws and of the hub 11 to permit the jaws and hub to be put in place or removed when the stops are at their'innermost position of adjustment.

What I claim is:

1. In a draw-back collet chuck, the combination of a plurality of jaws movable lo-ngitudinally of the chuck body, means dependent on the longitudinal movement for movinf the jaws radiallv inward, and three 110 angularly spaced stop members carried directly by the body and serving to definitely position a work blank held by the jaws.

2. In a draw-back collet chuck, the combination of a body having a beveled surface, a 115 plurality of jaws having beveled surfaces coperating with that of the body,and three angularly spaced stop members carried directly by the body and serving to definitely position a work blank held by the jaws.

3. In a draw-back collet chuck, the combination of a body having a beveled surface, three jaws having beveled surfaces coperating with that of the body, and three stop members carried directly by the body and 10i 125 cated respectively in the spaces between the jaws, the stops serving to definitely position a work lblank held by the jaws.

4. In a draw-back collet chuck, the combination of a plurality of jaws movably longi- 13o 

